Rotary pump



Patented Img. 3, 1920.

2 SHEETSSHEET I.

am.. n 4 o w 7 Mm 5 aT/WHW 7 wf. QUI/. 2 A 4 w o O .0 1 o I 03| 'HI .F ff/M A II I M II a/ W MOM f/m 7 M I l I M M W i H Il r/m l 4 f/ ya o h O 7 i .m/ o o @I F @10J 1. T. AUSER. ROTARY PUMP.

APPLICATION F|LE`D APR-22, I9I8-` 1,348,771

Patented Aug. 3, 1920.

2 SHEETS-SHEET 2.

fvefffm'r- 28 2 Z0 .fasepifjla er? 54 24, 26 2y www UNITED STATES PATENT orifice.

JOSEPH T. AUGER, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR 0F THREE-EIG-H'IHS T0 E. M. FERGUSON, OF ST. PAUL, MINNESOTA, AND- THREEFEIGHTHS T0 E. DULAC,

0F MINNEAPOLIS, MINNESOTA.

ROTARY PUMP.

Specification of Letters Patent.

Patented Aug. 3, 1920.

To all lwhom it may concern:

Be it known that I, JOSEPH T. AUGER, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Rotary Pumps, of which the following is a specification.

My invention relates to rotary pumps and in particular to pumps` of this type for use in connection with fire apparatus. The object is to provide a pump which will have a highv degree of eliiciency and at the same time will occupy a minimum space. A

The full objects and advantages of my invention will appear in connection with the detailed description and are particularly pointed out in the claims.

Referring to the drawings which illustrate the application of lmy invention in one form,-

Figure 1 is a vertical section on line 1-1 of Fig. 2. Fig. 2 is a horizontal section on line 2 2 of Fig. 1. Fig. 3 is a vertical transverse section on line 3-3 of Fig. 1. Fig. 4 is a det-ail showing the packing with which the blades of the rotary pistons are provided. Fig. 5 is a horizontal section of a slight modification.

The casing of the pump is made up of three castings, as follows: A base casting 10, an intermediate casting 12, and a top casting 14. The castings 10 and' 12 are secured together so as to form water tight joints by bolts 16 located in holes in ianges 18 on the casting 12 and holes in the top of the casting 10. The castings 12 and 14 are secured together so as to form water tight joints by bolts 2O which are located in holes ,in anges 22 on the castin 12 and holes in the bottom of casting 14. t will be apparent from this construction that the castings may be readily separated and removed from each other in order to afford easy access to the interior parts.

The base casting consists of a bottom plate 24, end walls 26, and side walls 28,- these walls extending up to a horizontal partition plate 30 having a central opening 32 which allows grit, gravel, etc., to fall into the chamber formed by the parts just mentioned. This chamber is provided with a detachable closure inorder that accumulations of refuse materlal may be removed whenever desired. This chamber is further provided with a draln pipe 36 controlled by a cock 37. Above vthe partition, the casting, at its two ends, is provided with inlet openings 38 which form an inlet chamber which is provided with pockets 40 at the two sides. In-

termediate casting ,12 is so shaped as to have two partially overlapping cylindrical piston chambers 42, as best shown in Fig. 1. The lower sides of this casting are bulged to conform to the shape of the pockets 40, as shown 1n Fig. 3 in order to formy lateral admission ports at 44. As will be seen from Fig. 1 the piston chambers extend downwardly into the intake chamber and the walls of these chambers at their lower line of intersection are provided with a ridge 46 which serves to divide the water entering the two chambers 42. A piston shaft 48 extends axially through each of the chambers 42 and at one end these piston shafts are provided with intermeshing gears 50 while one of said shaftsvat its opposite end is provided with a gear 52, by means of which power is transmitted to the pump. The shafts extend through stuffing boxes 54 at both sides of the piston chambers, and inside of said chambers, the shafts are provided with a plurality of intermeshing piston blades 56. The edges of these blades are provided with brass packing strips 58 having an insert of hydraulic leather 60, as shown in Fig. 4. The sides of the piston chambers 42 are provided with hydraulic leather strips 62, as shown in Fig. 1, to prevent slipping of water. These strips extend outwardly in a radial direction from the shafts of the pistons. The intermediate casting is provided with bridge members 64, best shown in Fig. 3, and also shown in dotted lines in Fig. 1. These bridge members serve to separate the intake and discharge openings and are each provided with a horizontal groove 66 extending from one shaft to the other and a vertical groove 68 extends from the middle of the horizontal groove downwardly into the pockets 40 to provide for escape of grit, gravel, etc. The intermediate castin at both sides is bulged outwardly to orm pockets 70 which constitute discharge ports for the water and allow it to be discharged into the chamber 72 in the upper casting. A plurality of discharge pipes 74. lead from this chamber in order that the water may be readily discharged in all directions. Above the discharge chamber 72 is an air chamber 76 in communication therewith through a port 7 8 formed i1 a partition between the discharge chamber and the air chamber.

Above the air chamber is a priming intake adapted to be closed by a screw threaded plug 8G. The pockets 70 at each side of the intermediate casting are separated by a dividing member, preferably formed by an upward extension of the bridge 64 as shown in Fig. 1. From this figure it is apparent that the piston blades 56 of the two rotary vpistons or cam-like members sweep past the upward extension or dividing member alternately in opposite directions. This prevents what is known as water-lock, since the water which is being forced by each piston blade is given ample opportunity to escape through the pockets into the discharge chamber 72. The upward extension of the bridge intermediate its length also decreases the liability of slippage of water. Still referring to Fig. l, it will be seen that the lower surface of the bridge curves downwardly in both directions from its intermediate portion, thereby increasing the vertical dimensions of the bridge and further decreasing liability of slippage.

The operation and advantages of my rotary pump will be readily "understood from the foregoing description. As shown in Fig. l, the piston chambers extend down into the intake for a considerable distance and hence the downwardly extending piston blades 56 will constantly stand in water. This arrangement entirely avoids the necessity of priming except in very severe weather when the water is drained ofi' through the drain pipe 36. lVhen it is necessary to resort to priming under such conditions the provision of the priming intake makes this extremely easy by merely removing the plug 80. The provision of an air chamber directly over the discharge chamber eliminates `tlie troublesome knocking and hose pulsations which is common in rotary pumps. The entire top of the pump may be readily removed` thus giving complete and easy access to all of the interior parts and providing an easy way for removing inside accumulations of sand and other material. The insert of hydraulic leather in the brass packing strip at each edge of the piston blades preventsthe working of metal against metal and greatly adds to the durability and eiiciency of the pumps and tends to decrease slippage. The provision of the hydraulic leather strips on the i sides of the piston chambers also decreases slippage. On account of the almost complete avoidance of slippage, a considerable reduction inthe amount of material used is possible and the seating space required is materially reduced. The provision of the horizontal and vertical grooves in the bridges affords an easy escape for grit, gravel, etc., and greatly decreases the destructive action on the piston blades 4and the bridge.

In Fig. 5 I have shown a slight modification in regard to the piston blades and hence have designated these'blades by the character 56 in this ligure. Except for these blades, the construction is the same as that in the other figures. the rotary pistons, `instead of having the piston blades extending all the way across, are separated at the middle and offset so that each blade on one side of the piston is located midway between two blades on the other side of the piston. This results in the water being discharged equally from both sides of the pistons, and counter-acts whatever tendency there might be for the water to surge back and forth.

I claim:

l. A rotary pump comprising a base member provided with an inlet chamber, an intermediate chamber containing overlapping piston chambers connected with said inlet chamber, a top member having discharge openings in connection with said pistou chambers, a partition in the upper portion of said top member, said partition being provided with a port whereby an air chamber is formed above said partition, the outer wall of said air chamber being provided with a priming opening, and a plug for closing said priming opening.

2. A rotary pump comprising a base member provided with an inlet chamber, a partition plate having an opening and constituting the bottom of said chamber, a bottom plate and walls constituting a refuse chamber below said inlet chamber, a detachable closure for said refuse chamber, an intermediate member containing overlapping piston chambers communicating with said inlet chamber, and a top member having discharge openings in communication with said piston chambers.

3. A rotary pump comprising a base member provided with an inlet chamber, an intermediate member containing overlapping piston chambers communicating with said inlet chamber, rotary pistons having intermeshing blades in said piston chambers, brass packing strips in the edges of said blades. an insert of hydraulic leather in said strips extending outwardly from the latter, and a top member having discharge openings in communication with said piston chambers.

4. A rotary pump comprising a casing containing two overlapping piston cham- In this modification 0 bers provided with lateral intake and disvertical groove extending from said horizoncharge openings, bridges separating said intal groove to the intake opening, and a top take and discharge openings, rotary pistons casing having a discharge chamber into 10 having intermeshing blades in said piston' Which said discharge openings lead.

5 chambers, each of said bridges being pro- Y In testimony whereof I hereunto affix my vided with a horizontal groove extending signature. between the shafts of said pistons, and a JOSEPH T. AUGER. 

